200121120102017 has 2 divisors, whose sum is σ = 200121120102018. Its totient is φ = 200121120102016.

The previous prime is 200121120101951. The next prime is 200121120102023. The reversal of 200121120102017 is 710201021121002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166992531108481 + 33128588993536 = 12922559^2 + 5755744^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121120102017 - 2²⁶ = 200121052993153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 200121120102017.

It is not a weakly prime, because it can be changed into another prime (200121120102047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060560051008 + 100060560051009.

It is an arithmetic number, because the mean of its divisors is an integer number (100060560051009).

Almost surely, 2^{200121120102017} is an apocalyptic number.

It is an amenable number.

200121120102017 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121120102017 is an equidigital number, since it uses as much as digits as its factorization.

200121120102017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 200121120102017 its reverse (710201021121002), we get a palindrome (910322141223019).

The spelling of 200121120102017 in words is "two hundred trillion, one hundred twenty-one billion, one hundred twenty million, one hundred two thousand, seventeen".